The last time I ordered a kit form them, the instruction sheet had all the ingredients listed. I would like to think that if a store sold a kit without a list of ingredients, they would tell you if you ask.

They give you a complete list, but all the grains are in one bag. It might make sense to brew the kit as-is, then tweak the next batch. That way, you'd know exactly what the tweak did for the beer. On one occasion, I purchased two kits for a Red ale & dry hopped one batch with extra hops.

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